<template>
<div class="wrapper" ref="wrapper">
  <div class="content">
    <slot></slot>
  </div>
</div>
</template>

<script>
import BScroll from 'better-scroll'

export default {
  name: 'Scroll',
  props: {
    probeType: {
      type: Number,
      default: 0
    },
    pullUpLoad: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      scroll: null
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper,{
      click: true,  // 普通元素可以有点击事件
      probeType: this.probeType, // 监听滚动
      pullUpLoad: this.pullUpLoad // 下拉加载更多
    })

    // 监听滑动的位置 并返回给调用方
    if (this.probeType === 2 || this.probeType === 3) {
      this.scroll.on('scroll', (position) => {
        this.$emit('scroll',position)
      })
    }

    // 下拉加载更多
    if (this.pullUpLoad) {
      this.scroll.on('pullingUp', () => {
        this.$emit('pullingUp')
      })
    }
  },
  methods: {
    scrollTo(x, y, time=300) {
      this.scroll && this.scroll.scrollTo(x, y, time)
    },
    refresh() {
      this.scroll && this.scroll.refresh()
    },
    finishPullUp() {
      this.scroll && this.scroll.finishPullUp()
    },
    getScrollY() {
      return this.scroll ? this.scroll.y : 0
    }
  }
}
</script>

<style scoped>
</style>
